Ashley, George Hall
[Other];
Fisher, Cassius Asa
[Other]
;
United States Congress House,
United States Geological Survey
Valuation of public coal lands: The value of coal land, by George H. Ashley. Depth and minimum thickness of beds as limiting factors in valuation, by Cassius A. Fisher. [U.S. Geological Survey Bulletin 424.]
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Valuation of public coal lands: The value of coal land, by George H. Ashley. Depth and minimum thickness of beds as limiting factors in valuation, by Cassius A. Fisher. [U.S. Geological Survey Bulletin 424.]